MOPCTH008
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
We present the results of transverse emittance and longitudinal current profile measurements of high bunch charge (>100 pC) beams produced in the dc gun-based Cornell photoinjector. In particular, we show that the cathode thermal emittance dominates the final emittance at charges up to 300 pC. Additionally, we demonstrate excellent agreement between optimized 3D space charge simulations and measurement, and show that the quality of the transverse laser distribution limits the optimal simulated and measured emittances.
TUICLH1024
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
The initial transverse distribution of a space charge dominated electron beam from low energy sources (100s of kV) can have a significant impact on the downstream emittance evolution. Using a liquid crystal spatial light modulator and visible light, the transverse laser distribution can be shaped to high accuracy with good efficiency. Using this shaped transverse distribution, adaptively shaped electron beams of high accuracy from a high voltage DC photoemission gun are presented.